MongoDB MCQ Questions - Optimization Strategies

This section focuses on "Optimization Strategies" in MongoDB. These Multiple Choice Questions (MCQ) should be practiced to improve the MongoDB skills required for various interviews (campus interview, walk-in interview, company interview), placements, entrance exams and other competitive examinations.

1. Which command returns a document that provides an overview of the database process's state?

A. serverStatus 
B. currentQueue
C. currentQu
D. clientStatus

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2. Which of the following setting defines what constitutes a "slow" operation?

A. fastOpThresholdMs
B. slowOpThresholdZs
C. slowOpThresholdMs
D. slowOpThresholdGs

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3. _________provide the number of times the lock acquisitions encountered deadlocks.

A. locks.deadlock
B. lock.deadlockCount
C. lock.deadlock
D. locks.deadlockCount

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4. _________ returns the queryPlanner information for the evaluated method.

A. db.explain()
B. db.collection.explain()
C. collection.explain()
D. explain()

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5. Point out the correct statement.

A. For read-heavy applications, deploy sharding and add one or more shards to a sharded cluster to distribute load among mongod instances
B. Spikes in the number of available connections can also be the result of application or driver errors
C. For read-heavy applications, increase the size of your replica set and distribute read operations to secondary members
D. All of the above

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6. With which storage engine, MongoDB uses memory-mapped files to store data?

A. MMAPv2
B. MMAPv1
C. WiredTiger
D. All of the above

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7. _________ returns the queryPlanner and executionStats information for the evaluated method.

A. cursor.explain()
B. tablescan.explain()
C. server.explain()
D. client.explain()

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8. If MongoDB can use an index scan to obtain the requested sort order, the result will not include a SORT stage

A. TRUE
B. FALSE
C. Can be true or false
D. Can not say

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9. Which of the following provides information on the MongoDB instance?

A. serverInfo
B. queryPlanner
C. executeStats
D. None of the above

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10. If the query planner selects a _________ the explain result includes an IXSCAN stage.

A. Document
B. Replica Set
C. Index
D. None of the above

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